title: [Progressive addition lenses--analysis of intermediate and near vision zones by deflectometry].
abstract: OBJECTIVE
  To determine near and intermediate vision areas of progressive addition lenses by means of a deflectometer.
  
  
  METHODS
  Twenty-two progressive addition lenses with +1.00 SD far power and two different additions (add 1.00 and 2.00; eleven subjects in each addition) were studied. Near and intermediate vision areas within 0.50 CD isoastigmatic lines were determined.
  
  
  RESULTS
  There are significant differences between near and intermediate vision areas of the studied lenses. There is also an inverse correlation between the addition and intermediate areas as well as direct relation between the vertical length of the corridor and its area.
  
  
  CONCLUSIONS
  Based on those findings, progressive addition lenses can be selected to suit the wearer's visual requirements.
authors.affiliation: Oftalmocenter Santa Rosa, Cuiabá (MT), Brasil.
authors.forename: Celso Marcelo
authors.initials: CM
authors.lastname: Cunha
authors.forename: Renato José Bett
authors.initials: RJ
authors.lastname: Correia
authors.forename: Antonio Augusto
authors.initials: AA
authors.lastname: Sardinha Neto
mesh_terms: D004867:Equipment Design; D005139:Eyeglasses / Q000592:standards*; D007368:Interferometry / Q000379:methods; D055620:Optical Phenomena